He cannot hurt you if you do not let him.
He is not a trustworthy partner and he is not a good friend. You know that.
He has problems, so, even though you feel that you love him, he will not be good for you. You know this really, otherwise you would not have posted here.
Don't give in to him or your attraction to him. It will do you no good in the long run.
You will find someone trustworthy, who respects you ~ but not if you keep waiting for this chap to come back to you.
Make a new start. Forget him. Do something interesting & enjoyable and see what and who is waiting around the corner!
Good luck & take care! 
"The secret of success is constancy to purpose" - Benjamin Disraeli.
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